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PDF KB3386 Data sheet ( Hoja de datos )
| Número de pieza | KB3386 | |
| Descripción | 400mA Buck/Boost Charge Pump LED Driver | |
| Fabricantes | Kingbor Technology | |
| Logotipo |  |
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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3386
400mA Buck/Boost Charge Pump LED Driver
FEATURES
■ Output Current up to 400mA
■ Up to 94% Efficiency in Torch Mode
■ Automatic Softstart Limits Inrush Current
■ Adjustable FLASH Mode
www.DataSheet■4U.xco1mand x2 Automatic Modes for High Efficiency
■ Minimum External Components: No Inductors
■ High Frequency Operation: 2.4 MHz
■ Low 50mV Reference for low Loss Sensing
■ 1+A Shutdown Current
■ PWM Dimming Control
■ Automatic Switchover Between Buck/Boost
■ Overvoltage Protection on Output
■ Overcurrent/Temerature Protection
■ Low Ripple and EMI
■ Space Saving 10-pin 3mm x 3mm DFN
Package
DESCRIPTION
The KB3386 is a current regulated charge pump ideal for
powering high brightness LEDs for camera flash applications.
The charge pump can be set to regulate two current levels for
FLASH and TORCH modes. The KB3386 automatically switches
modes between step-up and step-down ensuring that
LED current does not depend on the forward voltage. A low
current sense reference voltage (50mV) allows the use
of small 0603 current sensing resistors. The KB3386 is .
offered in 10-pin DFN package.
APPLICATIONS
■ White LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
■ Generic Lighting/Flash/Strobe
Applications
■ White LED Backlighting
VIN 1
C1 2
C2 3
FLASH 4
EN 5
10
KB3386 9
8
10 Pin DFN
7
6
VOUT
PGND
SGND
IFB
ISET
Now Available in Lead Free Packaging
APPLICATION CIRCUIT
VIN
(2.7 - 5.5V)
CIN
2.2+F
CFC
0.47+F
TORCH/FLASH
ENABLE
1 VIN
VOUT 10
2 C1 KB3386 PGND 9
3 C2
SGND 8
4 FLASH
FB 7
5 EN
RSET 6
400mA FLASH
COUT
1+F
WLED
FB=150mV
RSET
106K 1
RSENSE
0.331
1
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3386
400mA Buck/Boost Charge Pump LED Driver
FUNCTIONAL DIAGRAM
www.DataSheet4U.com
RSET 6
RSET
RSET BLOCK
+
-
{ }1.26V
V= RSET x11.2kohms
RSET REF
BG REF
+
-
1.26V
RESISTOR
TAPS
50mV
1 MUX
2x1
0s
FB REF
FB 7
+
FB
- COM P
SGN 8
CLK
FB COMP
COUNTER
32 COUNT
CLR
ONE
SHOT
FLASH 4
FLASH=1, S=1, RSET REF
FLASH=0, S=0, 50mV
EN 5
VIN 1
135C ON
145C OFF
THERMAL FAULT
OVER TEMP COMP
2.4MHZ
CLK
MODE SWITCH
0 =1X
1=2X
CHARGE
PUMP
SWITCHES
C1
C2
VOUT
CLK
SET
DOMINANT
S
0
R
PGND
The KB3386 is a charge pump regulator
designed for converting a Li-Ion battery
voltage of 2.7V to 4.2V to drive a white LED
used in digital still camera Flash and Torch
applications. The KB3386 has two modes
of operation which are pin selectable for
either Flash or Torch. Flash mode is usually
used with a pulse of about 200 to 300
milliseconds to generate a high intensity
Flash. Torch can be used continuously at a
lower output current than Flash and is often
used for several seconds in a digital still
camera “movie” mode.
THEORY OF OPERATION
The KB3386 also has two modes of opera-
tion to control the output current, the 1X
mode and 2X mode. Operation begins after
the enable pin EN receives a logic high, the
bandgap reference wakes up after 200+sec,
and then KB3386 goes through a soft-start
mode designed to reduce inrush current.
The KB3386 starts in the 1X mode, which
acts like a linear regulator to control the
output current by continuously monitoring
the feedback pin FB. In 1X mode, if the
KB3386 auto detects a dropout condition,
which is when the FB pin is below the
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet KB3386.PDF ] | |
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